Wrench.



No. 837,225. PATENTED NOV. 27, 190 6.

. J. H. HOLMAN.

WRENCH.

APPLICATION FILED AUG-24, 1906.

a i I J0 III.

WITNESSES:

[/VVENTOA J5 (ii/ 724907; film/ Mm 1 M A TTOR/VE Y5 UNITED STATES PATENTOFFICE.

J URNEY HUBERT HOLM AN, OF UNIONVILLE, MISSOURI.

W R E N C H Specification of Letters Patent.

Patented Nov. 2'7, 1906.

Application filed August 24,1906. Serial No. 331,933.

T 0 (Mini/tom it may concern:

Be it known that I, J URNEY HUBERT HOL- MAN, a citizen of the UnitedStates, residing at Unionville, in the county of Putnam and State ofMissouri, have invented a new and useful Wrench, of which the followingis a specification.

This invention has relation to wrenches especially adapted to be appliedto braces and it consists in the novel construction and arrangement ofparts, as hereinafter shown and described.

The object of the invention is to provide a wrench which is adapted toautomatically adjust itself to taps of different sizes or diameter andis constructed in a simple form and is of a substantial and durablenature.

In the accompanying drawings, Figure 1 is a vertical sectional view ofthe wrench. Fig. 2 is a perspective view of a jaw from one viewpoint.Fig. 3 is a perspective view of the jaw from another view-point.

The wrench comprises the head 1, from which extends the stem 2, andwhich in turn is provided with the squared end 3, adapted to be securedbetween the jaws of a brace. The said head is hollow, and in itsinterior is provided at opposite sides with longitudinally-extendinggrooves 1, the said grooves terminating short of the length of thehollow interior of the said head. The said head 1 is of greatercross-sectional dimension in one direction than in the direction atright angles thereto, and the grooves 4 are located in the sides oflesser transverse dimensions. The plate 5 normally rests upon the inneror bottom of the hollow provided in the head 1. The coil-spring 6 ismounted at one end upon said plate and is attached at its other end to asimilar plate 7. The tension of the spring 6 is such as to have atendency to force the plates 5 and 7 apart. The wrench-jaws 8 are of thesame construction, and a description of one will answer for both. Thejaw is provided at the end disposed within the hollow of the head withthe rounded knob 9. The said knob rests upon the plate 7. To one side ofthe said knob 9 is located the lateral arcuate swell 10. The said swell1O bears against the wall of the hollow provided in the head 1. Belowthe said swell 10 is located the side 11, which is straight for a partof its length and is curved at the bottom portion. The stud 12 islocated upon the side 11 and enters the groove 4. The outer end of theside 11 is extended laterally and outwardly, as at 13. The shoulder 15is formed at the extremity of the jaw and is provided with the'teeth 16,which extend transversely of the j aw at right angles to the directionin which the jaws open and close. The groove 17 extends longitudinallyalong the one side of the jaw from the shoulder 15. The side 18 of thesaid jaw opposite from the side 11 is provided with a semicircularrecess 19, which is struck on the same center as the arc of the swell10. At the edge the side 18 is provided with the semicircular flange 20,the radius of which is coincident with that of the recess 19. The side21 extends at an obtuse angle to the side 18 and at its upper end mergesinto the surface of the knob 9.

From the above description it is obvious that when two jaws 8, as abovedescribed, are placed together they may be pivoted with relation to eachother by a pin 22, which is passed through the centers of recesses 19and lugs 20. The flat spring 23 passes around the said pin 22 and islocated in the recesses 19. The ends of the said spring bear against thesides 18, and the tension of the said spring is such as to have atendency to cause the outer ends of the jaws 8 to separate.

In operation the wrench works as follows: By means of the tension of thespring 6 the jaws 8 are normally extended with relation to the head 1,and as a result of the tension of the spring 23 the gripping ends of thesaid jaws are spread apart. The inward movement of the jaws withrelation to the head is limited by the lugs 12 coming in contact withthe ends of the grooves 4, and the setting apart of the jaws is limitedby the sides of the head 1. In order to remove a tap or nut from a bolt,the wrench, which is first gripped in a brace, (not shown,) is presentedto the nut so that the shoulder 15 of one of the jaws engages the same.Pressure is then applied to the brace in a direction toward the bolt, sothat the j aw engaging the nut will be moved into the hollow of the body1, carrying the other jaw with it. This movement causes the free jaw tomove toward and engage the nut. W hile pressure is still maintained onthe brace, the latter is turned so as to work the nut off. Should theend of the bolt project beyond the nut, it is accommodated in thesemicylindrical grooves 18 of the jaws. When the nut is unscrewed, thepressure is relieved to permit the jaws to be automatically expelled orextended, so as to release the nut. To apply a nut to a bolt, the nut isplaced against the end of the boltand one jaw of the wrench brought intoen-' gagement therewith. Pressure is then applied on the brace, therebycausing the jaws to be brought together and firmly grip the nut,'whichlatter can then be screwed on the bolt by turning the brace.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is

1. A wrench comprising a hollow head, jaws mounted for limitedlongitudinal movement therein, said jaws having their tap-engaging ends,serrated shoulders and longitudinally-eXtending grooves.

2. A wrench comprising a hollow head,

jaws mounted for limited longitudinal movement therein, each said jawhaving near its lower end alateral swell which bears against one side ofthe head, each said jaw having a semicircular recess with the samecenter as the arc of said swell and an adjoining semicircular lug with aradius coincident with the radius of the recess, a spring entering saidrecess at an intermediate portion and bearing at its ends against saidjaws.

In'testimony that I claim the foregoing as my own I have hereto afiixedmy signature in the presence of two witnesses.

JURNEY HUBERT HOLMAN.

Witnesses:

H. L. HOLMAN, E. D PICKINPAUGH.

